Regensburg 2019 – wissenschaftliches Programm
MA 2.2: Vortrag
Montag, 1. April 2019, 09:45–10:00, H37
Ultrafast Demagnetization by Extreme Ultraviolet Light — •Leonard Müller1,3, André Philippi-Kobs1, Magnus H. Berntsen2, Wojciech Roseker1, Matthias Riepp1, Kai Bagschik1, Jochen Wagner3, Robert Frömter3, Miltcho B. Danailov4, Flavio Capotondi4, Emanuele Pedersoli4, Michele Manfredda4, Maya Kiskinova4, Michal Stránský6, Vladimir P. Lipp1,5, Beata Ziaja1,5, Hans Peter Oepen3, and Gerhard Grübel1,3 — 1Deutsches Elektronen Synchrotron, Hamburg, Germany — 2KTH Royal Institute of Tecchnology, Kista, Sweden — 3Universität Hamburg, Hamburg, Germany — 4Elettra-Sincrotrone Trieste, Basovizza, Italy — 5Center for Free-Electron Laser Science, Hamburg, Germany — 6Academy of Science of the Czech Republic, Prague, Czech Republic
One of the most intriguing topics within research on magnetism, ultrafast demagnetization , has greatly benefited from the advent of free-electron Lasers (FEL). Following a previous campaign , we report on a breakdown of the magnetic scattering cross section in Co/Pt multilayers for extreme ultraviolet (XUV) fluences >1 mJ/cm2 defining the threshold fluence for FEL experiments where the FEL is meant to be a non-invasive probe. XUV-induced demagnetization is identified to be the major mechanism behind the breakdown. Besides revealing the existence of ultrafast demagnetization in the XUV regime, our results demonstrate that it proceeds much faster than the demagnetization when using IR radiation.  Phys. Rev. Lett. 76, 4250 (1996),  Phys. Rev. Lett. 110, 234801 (2013).